There are 2 alcohol/food/lifestyle interactions with Flumezide (bendroflumethiazide / rauwolfia serpentina) which include:

Moderate

bendroflumethiazide ↔ Alcohol (Ethanol)

Moderate Drug Interaction

Before taking bendroflumethiazide, tell your doctor if you also use rauwolfia serpentina. You may need dose adjustments or special tests in order to safely take both medications together. The blood pressure lowering effects of this combination may be additive. You should take rauwolfia serpentina at bedtime and to notify your doctor if have dizziness or feel faint. It is important that you tell your healthcare provider about all other medications that you are using including vitamins and herbs. Do not stop using your medications without first talking to your doctor first.

bendroflumethiazide ↔ Alcohol (Ethanol)

Moderate Drug Interaction

Bendroflumethiazide and ethanol may have additive effects in lowering your blood pressure. You may experience headache, dizziness, lightheadedness, fainting, and/or changes in pulse or heart rate. These side effects are most likely to be seen at the beginning of treatment, following a dose increase, or when treatment is restarted after an interruption. Let your doctor know if you develop these symptoms and they do not go away after a few days or they become troublesome. Avoid driving or operating hazardous machinery until you know how the medications affect you, and use caution when getting up from a sitting or lying position. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

rauwolfia serpentina ↔ Alcohol (Ethanol)

Moderate Drug Interaction

Rauwolfia serpentina and ethanol may have additive effects in lowering your blood pressure. You may experience headache, dizziness, lightheadedness, fainting, and/or changes in pulse or heart rate. These side effects are most likely to be seen at the beginning of treatment, following a dose increase, or when treatment is restarted after an interruption. Let your doctor know if you develop these symptoms and they do not go away after a few days or they become troublesome. Avoid driving or operating hazardous machinery until you know how the medications affect you, and use caution when getting up from a sitting or lying position. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

thiazides - hyperlipidemia

Thiazide diuretics may increase serum triglyceride and cholesterol levels, primarily LDL and VLDL. Whether these effects are dose-related and sustained during chronic therapy are unknown. Patients with preexisting hyperlipidemia may require closer monitoring during thiazide therapy, and adjustments made accordingly in their lipid-lowering regimen

Do not stop taking any medications without consulting your healthcare provider.

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How to Prevent Deadly Drug Interactions

Some mixtures of medications can lead to serious and even fatal consequences.